“How many Keywords can be used per page?” is the most common question that swirls round most of our mind while publishing any article. But the exact answer is yet to be known as Search Engines never disclose their rules of selecting the most relevant pages. But there is general trend used by most of us about the number of keyword that should be present on each webpage.
Effects of too many keyword on a single page.
Most of the people try to use too many different types of keywords or key phrases on a single page thinking that this would help them bringing traffic to that page by hitting any of the keyword present there. But this is a mis-concept. While trying to use more than two or three different types of keyword would resulting in dilution of different keyword density on the same page resulting that your page would rank for non of the keyword search on the search engines.
It would be better if a whole site with 40 pages being created with in a biased way with two or three keywords instead of a single page with 40 keywords. The former type of sites will rank top of the search engine for those two or three targeted keyword and be able to bring more and more traffic due to its relevancy with the search terms. Each of the 40 page will provide 40 different roads to reach the same website. On the other hand the single page with 40 different keyword would compete with each other diluting the required keyword density to get found by search engine.
This also has the same effect on the ads being served by different advertising companies. The website with 2 or 3 primary keyword would get the most relevant ads compare to the next type where the ads serving has been affected by dilution of keyword density resulting in non related ads.
Conclusion: It would be better to focus on 2 or max up to 3 different keywords on a single page to get better search engine ranking results.
